Amorphous Nickel Tungstate Nanocatalyst Boosts Urea Electrooxidation
Amorphous Nickel Tungstate Nanocatalyst Boosts Urea Electrooxidation
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DOI：
10.1016/j.cej.2023.141826
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发表时间：
2023-02
影响因子：
15.1
通讯作者：
Lu Wang;Shangqian Zhu;Yian Wang;Zhipeng Liu;Yushen Liu;Qi Wang;M. Gu;Kedi Li;Xianda Sun;Liwei Yang;M. Shao
中科院分区：
文献类型：
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作者：
Lu Wang;Shangqian Zhu;Yian Wang;Zhipeng Liu;Yushen Liu;Qi Wang;M. Gu;Kedi Li;Xianda Sun;Liwei Yang;M. Shao
尿素氧化反应（UOR）是实现可持续清洁能源转化的重要反应。然而，UOR在常用的Ni基电催化剂上的反应速率仍然受到限制。本研究采用化学共沉淀法合成了一种新型的非晶态纳米NiWO4催化剂。令人印象深刻的是，所制备的非晶NiWO4的最大电流密度几乎是两个数量级高于结晶对应物。原位红外光谱和理论计算表明，非晶态NiWO4的上级活性不仅与其电化学活性中心的富集有关，而且与尿素反应物和CO2产物的结合能更合适。这项工作开辟了新的见解，成本效益的催化剂的发展，以及表明催化剂相工程作为一个有前途的战略，提高UOR性能。
Urea oxidation reaction (UOR) is an important reaction for achieving a sustainable and clean energy conversion. The reaction rates of UOR on the commonly used Ni-based electrocatalysts, however, are still limited. In this study, an amorphous NiWO4nanomaterial synthesized via a facile chemical co-precipitation method is developed as a novel and efficient catalyst for UOR. Impressively, the maximum current density of the prepared amorphous NiWO4is almost two orders of magnitude higher than that of the crystalline counterpart. The superior activity is attributed to not only the enrichment of electrochemically active sites, but also the more suitable binding energies toward urea reactant and CO2product on the amorphous NiWO4as revealed by in situ infrared spectroscopy and theoretical calculations. This work opens up new insights into the development of cost-effective catalysts as well as indicates catalyst phase engineering as a promising strategy for enhancing the UOR performance.